In order to reduce harmonic component of inductively coupled power transfer (ICPT) system, this work proposes a twochannel ICPT system based on the harmonic of inverse injection which detects the harmonic component of fundamental wave channel by controlling the harmonic of inverse injection from harmonic channel. First, based on the transfer admittance model, each harmonic component in the fundamental wave channel is analyzed to determine the size and ordinal number of harmonic which needs to be eliminated. Then, the principle block diagram of the system is given. Accordingly, the harmonic channel should possess good constant current and frequency-selecting property. The resonance compensation topology of the harmonic channel is determined by making the comparative analysis of frequency-selecting property of LCCL and LCL. Finally, conditions of the selected harmonic elimination can be derived by optimizing the whole system parameter. Experiment shows that when parameter optimization is achieved, the novel ICPT system can offset the selected harmonic of output current of high-frequency inverter in the fundamental wave channel, achieving high-quality electric power transmission.

Aiming at the influence of coupling coefficient variation on the output voltage of a high-power LCC-S topology inductively coupled power transfer (ICPT) system, a synchronous three-phase triple-parallel Buck converter is used as the voltage adjustment unit. The control method for the three-phase current sharing of synchronous three-phase triple-parallel Buck converter and the constant voltage output ICPT system under the coupling coefficient variation is studied. Firstly, the hybrid model consisting of the circuit averaging model of the three-phase triple-parallel Buck converter and the generalized state-space average model for the LCC-S type ICPT system is established. Then, the control methods for three-phase current sharing of the synchronous three-phase triple-parallel Buck converter and constant voltage output of ICPT system are studied to achieve the multi-objective integrated control of the system. Finally, a 3.3 kW wireless charging system platform is built, the experimental results have verified the effectiveness of the proposed modeling and control method, and demonstrated the stability of the ICPT system.

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